A. Usethe Student'stdistributionto findtcfor a 0.95 confidence level when the sample is24. (Round your answer to three decimal places.)
B. Usethe Student'stdistributionto findtcfor a 0.99 confidence level when the sample is9.
C. Usethe Student'stdistributionto findtcfor a 0.90 confidence level when the sample is25. (Round your answer to three decimal places.)
TABLE 4 Critical Values for Student's t Distribution c is a confidence level one-tail area 0.250 0.125 0.100 0.075 0.050 0.025 0.010 0.005 0.0005 two-tail area 0.500 0.250 0.200 0.150 0.100 0.050 0.020 0.010 0.0010 d.f. 0.500 0.750 0.800 0.850 0.900 0.950 0.980 0.990 0.999 Area c 1.000 2.414 3.078 4.165 6.314 12.706 31.821 63.657 636.619 0.816 1.604 4 1.886 2.282 2.920 4.303 6.965 9.925 31.599 -t w 0.765 1.423 1.638 1.924 2.353 3.182 4.541 5.841 12.924 0.741 1.344 1.533 1.778 2.132 2.776 3.747 4.604 8.610 a UI A 0.727 1.301 1 1.476 1.699 2.015 2.571 3.365 4.032 6.869 0.718 1.273 1.440 1.650 1.943 2.447 3.143 3.707 5.959 One-tail area 0.711 1.254 1.415 1.617 1.895 2.365 2.998 3.499 5.408 10 00 - 0.706 1.240 1.397 1.592 1.860 2.306 2.896 3.355 5.041 0.703 1.230 1.383 1.574 1.833 2.262 2.821 3.250 4.781 Right-tail 10 0.700 1.221 1.372 1.559 1 1.812 2.228 2.764 3.169 4.587 area 11 0.697 1.214 1.363 1.548 1.796 2.201 2.718 3.106 4.437 12 0.695 1.209 1.356 1.538 1.782 2.179 2.681 3.055 4.318 13 0.694 1.204 1.350 1.530 1.771 2.160 2.650 3.012 4.221 14 0.692 1.200 1.345 1.523 1 1.761 2.145 2.624 2.977 4.140 15 0.691 1.197 1.341 1.517 1.753 2.131 2.602 2.947 4.073 16 0.690 1.194 1.337 1.512 1.746 2.120 2.583 2.921 4.015 Left-tail 17 0.689 1.191 1 1.333 1.508 1.740 2.110 2.567 2.898 3.965 area 18 0.688 1.189 1.330 1.504 1.734 2.101 2.552 2.878 3.922 -t 0 19 0.688 1.187 1.328 1 1.500 1.729 2.093 2.539 2.861 3.883 20 0.687 1.185 1.325 1.497 1.725 2.086 2.528 2.845 3.850 21 0.686 1.183 1.323 1.494 1.721 2.080 2.518 2.831 3.819 22 0.686 1.182 1.321 1.492 1 1.717 2.074 2.508 2.819 3.792 23 0.685 1.180 1.319 1.489 1.714 2.069 2.500 2.807 3.768 Two-tail area 24 0.685 1.179 1.318 1.487 1.711 2.064 2.492 2.797 3.745 25 0.684 1.178 1.316 1.485 1.708 2.060 2.485 2.787 3.725 26 0.684 1.177 1.315 1.483 1.706 2.056 2.479 2.779 3.707 Area 27 0.684 1.176 1.314 1.482 1.703 2.052 2.473 2.771 3.690 28 0.683 1.175 1.313 1.480 1.701 2.048 2.467 2.763 3.674 -t 0 29 0.683 1.174 1.311 1.479 1.699 2.045 2.462 2.756 3.659 30 0.683 1.173 1.310 1.477 1.697 2.042 2.457 2.750 3.646 35 0.682 1.170 1.306 1.472 1.690 2.030 2.438 2.724 3.591 40 0.681 1.167 1.303 1.684 2.021 2.423 2.704 3.551 45 0.680 1.165 1.301 1 1.465 1.679 2.014 2.412 2.690 3.520 50 0.679 1.164 1.299 1.462 1.676 2.009 2.403 2.678 3.496 60 0.679 1.162 1.296 1.458 1.671 2.000 2.390 2.660 3.460 70 0.678 1.160 1.294 1.456 1.667 1.994 2.381 2.648 3.435 80 0.678 1.159 1.292 1.453 1.664 1.990 2.374 2.639 3.416 100 0.677 1.157 1.290 1.451 1.660 1.984 2.364 2.626 3.390 500 0.675 1.152 1.283 1.442 1.648 1.965 2.334 2.586 3.310 1000 0.675 1.151 1.282 1.441 1.646 1.962 2.330 2.581 3.300 0.674 1.150 1.282 1.440 1.645 1.960 2.326 2.576 3.291 For degrees of freedom d.f. not in the table, use the closest d.f. that is smaller
